It implicates not just one slipped gear but many: disruptions in long-established connections between productivity and earnings, between labor and capital, between top earners and everyone else, between men and work, between men and marriage. Together, they are bringing the economy to a place where a large and growing group of people—indeed, whole communities—are isolated from work, marriage, and higher education. That place might look like today’s America, only with a larger welfare state. But it might just as easily bring social unrest and class resentment of a magnitude the country hasn’t known before.